ConnectionResetError: [WinError 10054]

[yun201720]

When I try to get bandpass using ''band = sncosmo.get_bandpass('sdssi')'', the server refused to give me any thing. This is also the problem when I try to get a model source with "model = sncosmo.Model(source='salt2')", I do not know why.

[rbiswas4]

Could you please specify :

• version of sncosmo
• version of python
• What is the error message when the server 'refuses to give' you anything

For what it is worth, I find that on

import sncosmo
 sncosmo.__version__
Out[6]: '2.1.0'

band = sncosmo.get_bandpass('sdssi')
Downloading http://sncosmo.github.io/data/bandpasses/sdss/sdss_i.dat
|========================================================================| 1.2k/1.2k (100.00%)         0s

worked perfectly.

[yun201720]

Hi，

here is the out-put information:

Python 3.8.3 (default, Jul 2 2020, 16:21:59)

sncosmo.version
'2.3.0'
band = sncosmo.get_bandpass('sdssi')

Traceback (most recent call last):
File "", line 1, in
File "/home/yun/anaconda3/lib/python3.8/site-packages/sncosmo/bandpasses.py", line 27, in get_bandpass
return _BANDPASSES.retrieve(name)
File "/home/yun/anaconda3/lib/python3.8/site-packages/sncosmo/_registry.py", line 160, in retrieve
self._instances[key] = func(*args, name=name)
File "/home/yun/anaconda3/lib/python3.8/site-packages/sncosmo/builtins.py", line 73, in load_bandpass_remote_aa
abspath = DATADIR.abspath(relpath)
File "/home/yun/anaconda3/lib/python3.8/site-packages/sncosmo/utils.py", line 464, in abspath
url = self._get_url(relpath)
File "/home/yun/anaconda3/lib/python3.8/site-packages/sncosmo/utils.py", line 434, in _get_url
self._fetch_redirects()
File "/home/yun/anaconda3/lib/python3.8/site-packages/sncosmo/utils.py", line 427, in _fetch_redirects
f = urlopen(self._remote_root + "redirects.json")
File "/home/yun/anaconda3/lib/python3.8/urllib/request.py", line 222, in urlopen
return opener.open(url, data, timeout)
File "/home/yun/anaconda3/lib/python3.8/urllib/request.py", line 525, in open
response = self._open(req, data)
File "/home/yun/anaconda3/lib/python3.8/urllib/request.py", line 542, in _open
result = self._call_chain(self.handle_open, protocol, protocol +
File "/home/yun/anaconda3/lib/python3.8/urllib/request.py", line 502, in _call_chain
result = func(*args)
File "/home/yun/anaconda3/lib/python3.8/urllib/request.py", line 1379, in http_open
return self.do_open(http.client.HTTPConnection, req)
File "/home/yun/anaconda3/lib/python3.8/urllib/request.py", line 1354, in do_open
r = h.getresponse()
File "/home/yun/anaconda3/lib/python3.8/http/client.py", line 1332, in getresponse
response.begin()
File "/home/yun/anaconda3/lib/python3.8/http/client.py", line 303, in begin
version, status, reason = self._read_status()
File "/home/yun/anaconda3/lib/python3.8/http/client.py", line 264, in _read_status
line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
File "/home/yun/anaconda3/lib/python3.8/socket.py", line 669, in readinto
return self._sock.recv_into(b)
ConnectionResetError: [Errno 104] Connection reset by peer

I am not sure if there is net restrictions. I am now at XInjiang China.

[rbiswas4]

I tried on sncosmo version 2.3 (pulling the latest development version master branch) and ran that on python 3.7. I am still able to run this. So, this might be related to net restrictions. Could you please check if you can download this file: The sdss bandpass file is :
https://github.com/sncosmo/sncosmo.github.io/blob/master/data/bandpasses/sdss/sdss_i.dat

The file looks like (first few lines):

6600   0.0002
6620   0.0007
6640   0.0011
6660   0.0016

If you cannot reach the file, then we would know it is a restriction problem. It is a bit surprising as you seem to be able connect to github.

[yun201720]

Thanks for check, I have tried to download the above file, and I can reach this one. I have modified the ip-pointing to github, so I can connect github. I wonder if I can download all the bandpass files to sncosmo, but where do I put them?

[yun201720]

By the way, I have light curves in AB magnitudes, how can I convert them to flux so that they can fit for sncosmo?
Thanks,

[rbiswas4]

Thanks for check, I have tried to download the above file, and I can reach this one. I have modified the ip-pointing to github, so I can connect github. I wonder if I can download all the bandpass files to sncosmo, but where do I put them?

It is a bit confusing then why the download did now work. You can download the bandpasses. The directory information is described in https://sncosmo.readthedocs.io/en/stable/configuration.html

in the sncosmo directory (for example in my case this is in ${HOME}/.astropy/cache/sncosmo)

The bandpass files are in locations like ${HOME}/.astropy/cache/sncosmo/bandpasses/sdss/sdss_i.dat

By the way, I have light curves in AB magnitudes, how can I convert them to flux so that they can fit for sncosmo?

You can convert the mags to flux as
flux = 10.0**(-0.4 * (mag -zp))
You can choose any zp that does not cause underflows or overflows, and you will need the zp column as well. The flux_errors are often calculated using the magerr:

flux_err = np.abs(flux*(-magerr/2.5*np.log(10)))```
This is not strictly correct, but strictly speaking magnitudes do not have a single error bar. So, probably the `flux_err` calculation should invert whatever was used to calculate the `magerr`

[benjaminrose]

@yun201720 Is this issue happening on Windows?